PRIMARY OBJECTIVES: I. To determine the surgical complication rate in patients undergoing EBS for benign or malignant disease and the 5-year local recurrence rate following endoscopic breast surgery among subjects undergoing EBS for breast cancer at USC. SECONDARY OBJECTIVES: I. To evaluate the safety, breast cosmesis and patient quality of life following EBS. OUTLINE: Patients undergo endoscopic breast surgery. After completion of study treatment, patients are followed up every 6 months for 5 years.